Website SideNav Code

<!DOCTYPE html>
<html>
<head>
<style>
body {
    font-family: cursive, sans-serif;
}

.sidenav {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #111;
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 60px;
}

.sidenav a {
    padding: 8px 8px 8px 32px;
    text-decoration: none;
    font-size: 25px;
    color: #818181;
    display: block;
    transition: 0.3s
}

.sidenav a:hover, .offcanvas a:focus{
    color: #f1f1f1;
}

.sidenav .closebtn {
    position: absolute;
    top: 0;
    right: 25px;
    font-size: 36px;
    margin-left: 50px;
    margin-top: 50px;
}

@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}

.myButton {
    background-color:#44c767;
    -moz-border-radius:28px;
    -webkit-border-radius:28px;
    border-radius:28px;
    border:1px solid #18ab29;
    display:inline-block;
    cursor:pointer;
    color:#ffffff;
    font-family:Arial;
    font-size:17px;
    padding:5px 21px;
    text-decoration:none;
    text-shadow:0px 1px 0px #2f6627;
}
.myButton:hover {
    background-color:#5cbf2a;
}
.myButton:active {
    position:relative;
    top:1px;
}

#w3schools {
    font-size: 10px;
}

</style>
</head>
<body>

<div id="mySidenav" class="sidenav">
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
  <a href="http://crazykk1449.weebly.com/index.html">Home</a>
  <a href="http://crazykk1449.weebly.com/contact.html">Contact</a>
  <a href="http://crazykk1449.weebly.com/blogs.html">Blogs</a>
  <a href="http://crazykk1449.weebly.com/videos.html">Videos</a>
  <a href="http://crazykk1449.weebly.com/social-media.html">Social Media</a>
  <a href="http://crazykk1449.weebly.com/other-websites.html">Other Websites</a>
  <a href="http://crazykk1449.weebly.com/other-servers.html">Other Servers</a>
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  <a href="https://www.w3schools.com/" onclick="window.open(this.href); return false;" onkeypress="window.open(this.href); return false;" id="w3schools">Side nagivator code cortesy of W3Schools.com</a>
</div>

<button style="font-size:30px;cursor:pointer" onclick="openNav()" class="myButton">&#9776; Open</button>

<script>
function openNav() {
    document.getElementById("mySidenav").style.width = "250px";
}

function closeNav() {
    document.getElementById("mySidenav").style.width = "0";
}
</script>

</body>
</html>